Across
4. Animals weighing more than 100 pounds when alive. The Mammoth, Mastodon,
Giant sloth, and Short-faced cave bear are good examples.
5. Fossil signs left behind such as footprints, nests, and burrows.
6. A remnant, impression, or trace of an animal or plant from a former
geologic time that has been preserved in the earth's crust.
8. A replica of an organism created when minerals use the organism as
a mold to create the replica. For example, a shell fills with minerals,
the shell dissolves away and the ____ (inside of the shell) is left
behind.
12. A large group of arthropods abundant in the Paleozoic seas. They
had segmented exoskeletons divided into three lobes.
13. These fossils are indicators of a particular time in the Earth's
history.
14. The animals of a specified region or time.
15. All the processes that involve the burial of a plant or animal in
sediment and the eventual preservation of all, part, or a trace of it.
16. The study of form and structure of animals and plants and their
fossil remains.
17. The branch of geology concerned with the formation, composition,
ordering in time, and arrangement in space of sedimentary rocks.
19. A principle which describes the layering of rocks, and states that
the oldest rock is on the bottom and the youngest is on the top.
Down
1. The place or type of site where a plant or animal naturally or normally
lives and grows.
2. An animal with four feet.
3. A process that replaces living materials (wood or bone) with mineral
matter. Organic matter is thus turned to stone.
7. Any two-footed animal.
9. A fossil that is large enough to be studied without a microscope.
10. A cavity in which a substance is shaped. A fossil used to create
a replica, or cast.
11. A fossil so small that it must be studied with a microscope.
14. The plants of a specified region or time.
18. Scientists who study fossils.